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EDEDTRIC HEATER Filed March 31, 1930 2 Sheets-Sheet l //VV/V 70/35 h a Z2402 J 525568 John M 6116 7 jTTO/YNEY Sept. 13, 1932. w. J. BISSET ET AL ELECTRIC HEATER Filed March 31, 1930 2 Sheets-Sheet 2 Y mfi fi m M56 fl fig W W n Mw Patented Sept. 13, 1932 UNITED STATES PATENT OFFICE WALLACE .T. BISSET, or BLooMsBURG, rENNsY LvA LA, AND JOHN w. sHEEE R, 0E GLEN RIDGE, NEW JERSEY, ASSIGNORS To AMERICAN CAR AND FOUNDRY COMPANY, on NEW YORK, N. Y., A CORPORATION OF NEW JERSEY ELECTRIC HEATER Application filed March 31, 1930. Serial No. 440,328..

be of such design that heaters of different,

capacities and adapted to work of different sizes may be readily manufactured with minimum changes in the various parts.

In the drawings:

Fig. 1 is a vertical section taken as on the line 1-1 of Fig. 3 of an electric heater constructed in accordance with this invention;

Fig. 2 is a. vertical section taken on the line 22 of Fig. 1 showing the framing and coil arrangement in elevation; and

Fig. 3 is .a horizontal section taken on the line 3-3 of Fig. 2.

In the drawings, the heater is shown as comprising a suitable rectangular base com,

posed of side channels 1 which are joined at their ends to end channels 2 by suitable angles 3. To the side channels 1 vertical members 4 are attached. The members 4 shown as I-bearns, are joined at their upper ends by a channel 6 placed with its web horizontal and its flanges projecting clownwardly. To the outer flanges of the I-beams 4 are connected horizontally placed angles 8 forming brackets which carry rectangular magnetic cores 10 having side portions 12 which rest upon the brackets 8 and end portions 14 connecting the side portions 12.

The cores are held to the brackets 8 by channel pieces 16 the ends of which project beyond the cores 10 and are secured to the projecting ends of the brackets 8 by bolts 18. Suitable insulation is placed between the brackets 8 and the I-beams 4 and between the magnetic cores 10 and the brackets 8 and channels 16. Upon the end portions 14 of the core 10 are mounted suitable primary or magnetizing coils 20, two coils being placed on each end portion 14 adjacent to the side portions 12 thus spacing the coils 20 so that there is considerable clearance between the coils 20 on each end portion 14. The coils 20 are formed before being placed upon the end portions 14 and are separated from the core 14 by suitable insulation and protected by suitable shields 22. These coils will be I wound and connected for the voltage of the power circuit and output desired but as the particular connections of these coils to the power circuit forms no part of this invention, the connections are not shown.

Mounted upon the two lower cores 10 and placed between the coils 20 are insulation blocks 24 connected by bolts 26 which extend through the blocks 24. The bolts 26 also extend through the laminations forming the secondary coil 28 which is positioned between the inner flanges of the I-beams 4 and separated therefrom by suitable insulation. The secondary coil 28 extends through the openings of all the magnetic cores 10 between the primary coils 20 and is formed of a plurality of fiat flexible copper strips which are welded at their ends to terminals 30. To the terminals 30 are attached contacts 32 formed with passages 34 to which may be connected fleX- ible hose so as to provide water cooling for the contacts 32. To the terminals 30 are attached lugs 36 to which are pivotally connected levers 38 and 40, the lever 88 being connected to the lower terminal 30 and pivot- 59 ally mounted in brackets 42 supported upon a channel 44 attached to the lower flanges of the side members 1. The lever 40 connected to the upper terminal 30 is pivotally supported in brackets 46 mounted upon the tie 35 member 6. To the outer ends of levers 88 and 40 are pivotally connected adjustable rods 48 and 50 respectively which have their opposite ends pivotally connected to the lever 52 fulcrumed on brackets 54 carried by standards 56 attached to the frame members 1. To operate the lever 52 there is provided a cylinder 58 having the piston rod 60 thereof connected by a link 62 to the outer end of the lever 52. Extending between the side members 1 is a channel 64 having an opening therein through which passes the rod 48 and mounted between a retainer 66 which bears against the channel 64 and retainer 68 which bears against the end of the rod 48 isa spring 70 of suflicient strength to operate the rods 48 and 50 so as to hold the contacts 32 in engagement with WOIK placed between the contacts. In this connection, it will be noted, that the spring 70 has to be of sufficient strength to support the weight of the object to be heated.

In the operation of this device, fluid admitted to the cylinder 58 under pressure'will operate the rod 60 and the lever 52, operat ing the rods 4P8 and 50 against the action of the spring to separate the contacts 32 which will bring the contacts to the position shown in broken lines in Figure 1.

With the contacts thus separated a work piece 72 surrounded by a tube 74 of suitable heat resistant non-magnetic material will be placed upon the lower contact 32 and the fluid discharged from the cylinder 58 whereupon the spring 70 will operate the rods 48 and 50 to bring the contacts 32 into proper bearing contact with the work piece 72 and complete the circuit through the secondary coil. Upon completion of the heating of the work piece 72, the fluid will be again admitted to the cylinder 58 to separate the contacts 32 whereupon the heated work piece 72 can be removed leaving the contacts ready to receive the next work piece.

In this construction, it will be noted, that while there are provided a plurality of complete magnetic cores arranged in spaced relation, one above the other with a plurality of primary coils upon each of the magnetic cores the secondary coil is common to all of the magnetic cores and extends through all of the cores. It will also be noted that this arrangement permits of designing heaters for work pieces of different lengths by varying the number of the magnetic cores 10 used, the lengths of the vertical members and the secondary coil being in many cases, the only dimensions in which any change will be necessary.

lVhile the preferred form of the invention has been shown and described, itis to be understood that the invention is not limited to the exact details of the construction shown and described as it is obvious that various modifications thereof within the scope of the claims will occur to persons skilled in the art.

lVhat is claimed is:

1. In an electric heater, a plurality of magnetic cores arranged in a column, primary coils for said cores, a flexible secondary coil extending through all of said cores, and work holding contacts carried by the secondary coil and releasable from the work upon flexing of said secondary coil.

2. In an electric heater, a plurality of rectangular magnetic cores spaced apart vertically, means interposed between adjacent cores for supporting the cores in their spaced relation, a plurality of primary coils for each core, a secondary coil extending through all of said cores and work holding contacts carried by the secondary coil.

3. In an electric heater, a plurality of magnetic cores, primary coils for said cores, spacing blocks interposed between adjacent cores and to which said cores are secured for retaining the cores in spaced relation and a work holding secondary coil common to all said cores carried by said blocks.

4. In an electric heater, a plurality of magnetic cores arranged in vertical spaced relation, primary coils for said cores, insulating material between adjacent cores and to which the latter are connected, a secondary coil extending through all of said cores and supported by said insulating material, and work holding contacts carried by said secondar coil and adapted to releasably support wor to be heated.

5. In an electric heater, a frame, a plurality of horizontally arranged, vertically spaced magnetic cores carried by said frame, primary coils for said cores, interposed between said cores and to which the latter are connected for retaining said cores in spaced relation, a secondary coil secured to and supported by said insulation blocks and extending through all of said cores, work holding contacts carried by said secondary coil, and

means for moving said contacts relative to each other whereby to release the same from the work.

6. In an electric heater, a plurality of horizontally arranged, vertically spaced magnetic cores, primary coils on said cores, a flexible open circuit secondary coil extending through all of said cores, contacts carried by said secondary coil and operating means for said contacts.

7. In an electric heater, a frame, a plurality, of horizontally arranged, vertically spaced magnetic cores carried by said frame, a plurality of primary coils on each core, a

flexible open circuit secondary coil extending through all of said cores, terminals on said secondary coil, levers mounted on said frame and connected to said terminals and operating means for said levers.

8. In an electric heater, a frame, a plural ity of horizontally arranged, vertically spaced magnetic cores carried by said frame, a plurality of primary coils on each core, insulation blocks carried by the cores, a flexible open circuit secondary coil carried by said blocks and extending through all of said cores, terminals on said secondary coil, levers mounted on said frame and connected to said terminals and operating means for said levers.

9. In an electric heater, a frame comprising spaced columns horizontally arranged, vertically spaced magnetic cores supported by said columns, primary coils on each core, blocks carried by said cores, a flexible open lip IZL.

circuit secondary coil carried by said blocks and extending between said columns through said coils, contacts carried by said secondary coil and operating means for said contacts.

In Witness whereof I have hereunto set my hand.

JOHN W. SHEFFER. In Witness whereof I have hereunto set my hand.

WALLACE J. BISSET. 

